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The more we understand about the universe, the stranger it gets. Here are 5 facts about the cosmos that put everyday problems into perspective.
1. The universe is mostly empty space
If you added up every atom in everything that exists — stars, planets, cosmic dust — matter would still make up a tiny fraction of the observable universe. The rest is, essentially, vacuum.
2. The starlight you see might be “from the past”
Since light takes time to travel, when you look at a distant star, you’re seeing it as it was years, centuries, or millennia ago — some of them might not even exist anymore.
3. The universe’s expansion is accelerating
Not only is the universe expanding, that expansion is speeding up over time — a phenomenon attributed to mysterious “dark energy,” something scientists still can’t fully explain.
4. There are more stars in the universe than grains of sand on Earth
Estimates put the number of observable stars at around 10 followed by 22 zeros — a number that far exceeds the amount of sand on every beach and desert on the planet combined.
5. The universe will eventually “cool” to near absolute zero
One theory about the universe’s ultimate fate is “heat death”: as expansion continues, energy keeps dissipating until practically nothing happens anymore — a process that would take trillions of years.
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